Hello Florian,
what has not been addressed so far is your planned heat generation/heat distribution. While the control (reduced operation, etc.) is certainly difficult with underfloor heating, it should definitely be planned with radiators, especially as this should be comfortably possible in 2016. For this, it is important that you achieve a sensible solution between the heat generator and the distribution, so that ideally they are networked together. Are there already concrete plans here?
In your current situation, you are also setting the course for the future here. Of course, many things can also be retrofitted later using wireless solutions, which is always disadvantageous in terms of maintenance (battery replacement) and functionality (range, …). Therefore, even if you do not yet have a direct use for it in some places, I would handle empty conduits "generously" at least, to be prepared for future renovations, etc.
Best regards, Erik